Greenly Garden
Get the app
EN

When to plant crocuses in Spokane: 15 September – 23 November

In Spokane, crocus: plant from 15 September to about 23 November.

Bulbs are best planted early in the window: late-planted bulbs may flower later or less well. Late planting works only while the soil can be dug. Mulch after planting.

The date is about two weeks before the average daily temperature here falls below 0 °C (ten years of weather): an estimate, not the day the ground freezes, and a cold spell can freeze it earlier. Sources: Iowa State University Extension, Wisconsin Horticulture Extension, UNH Extension, RHS, how the ground freezes (NRC Canada, CBD-26).

Crocus in Spokane: soil, season and weather

Nights then average below 0 °C in November–March; the coldest, January, averages -5.2 °C.

Planting15 September – 23 November
First autumn frost15 October
Coldest nightsJanuary, -5.2 °C
Soil back at 1 °C in spring14 February
Daylight12:38 on 15 September
Daylight at the winter solstice8:25

The same dates in Spokane hold for Garlic, Tulip, Daffodil and Hyacinth.

Crocus in Spokane: depth, winter cold, pests and pets

Plant Dutch crocuses (Crocus vernus) about 12 cm deep and 9 cm apart; smaller species go 7–10 cm deep (RHS).

In Spokane the average daily temperature stays at 10 °C or lower for about 27 weeks a year (our estimate from ten years of monthly weather). For this bulb Wisconsin Horticulture Extension gives a cold period of 15–17 weeks at about 2–10 °C. The winter here gives that in the ground, so the bulbs need no pre-chilling.

Crocuses multiply on their own (they naturalise); in a lawn, hold off mowing until their leaves die back (RHS).

Birds, squirrels and rodents damage crocuses; planting under metal mesh may reduce losses (RHS). Spring crocus gives dogs and cats vomiting and diarrhoea; do not confuse it with autumn crocus (Colchicum), which is very toxic (Pet Poison Helpline).

Sources: RHS, Wisconsin Horticulture Extension, Pet Poison Helpline.

Crocus in nearby cities

Around Spokane, Calgary is 14 days earlier and Seattle 40 days later.

CityDistanceDateDifference
Missoula271 km6 September – 12 November9 days earlier
Kelowna289 km1 October – 27 November16 days later
Seattle367 km25 October – end of December40 days later
Olympia418 km16 October – end of December31 days later
Helena425 km3 September – 5 November12 days earlier
Calgary449 km1 September – 26 October14 days earlier

Where to buy crocus for planting in Spokane

Planting stock goes into the ground from 15 September to about 23 November; buy it before that. Within 15 km of Spokane OpenStreetMap lists 13 garden centres, 6 farm-supply shops, 4 plant nurseries and 1 market (collected 20 October 2026).

Places: © OpenStreetMap contributors, ODbL.

Questions

When to plant crocuses in Spokane?

In Spokane, crocus: plant from 15 September to about 23 November. Bulbs are best planted early in the window: late-planted bulbs may flower later or less well. Late planting works only while the soil can be dug. Mulch after planting.

When is the last spring frost in Spokane?

Last spring frost around 21 April, first autumn frost around 15 October.

Other crops in Spokane, with their dates